Added two 5/16" small gussets to the angle bracket to beef it up some. Drilled 3 x 11/16" holes for the 3 x 5/8" (gr.#8)bolts that will secure the air-spring mount arm to the mount. Note: I made the bolt holes 1/16" larger for two reasons (1)I'm not a machinist and only have a simple drill press to drill these holes in correct alignment and knew I'd be off a bit so this would provide some wiggle room. (2)slightly larger holes would also provide useful horizontal adjustment to help correctly align the lower spring mount with the upper one on the chassis. The following pics show the mount in place and the welding tracks where it's attached to the trailing arm.
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